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riscv: ftrace: correct the condition logic in function graph tracer 

The condition should be logical NOT to assign the hook address to parent
address. Because the return value 0 of function_graph_enter upon
success.

Fixes: e949b6db51 (riscv/function_graph: Simplify with function_graph_enter())
Signed-off-by: Zong Li <zong.li@sifive.com>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: stable@vger.kernel.org
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
alistair/sunxi64-5.5-dsi
Zong Li 2019-12-23 16:46:13 +08:00 committed by Paul Walmsley
parent cfda8617e2
commit 1d8f657982
1 changed files with 1 additions and 1 deletions
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arch/riscv/kernel/ftrace.c
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@ -142,7 +142,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
*/
old = *parent;
if (function_graph_enter(old, self_addr, frame_pointer, parent))
if (!function_graph_enter(old, self_addr, frame_pointer, parent))
*parent = return_hooker;
}